Description: Sixteen year old son of H. V. Kaltenborn, news editor for Columbia Broadcasting System, was walking with father, mother, and sister on Leipsiger Strasse in heart of Berlin when they saw a group of S.A. men marching down the street; stopped to look in shop window until procession passed; son suddenly seized from behind by civilian and struck in face; Kaltenborn did not report to police as he was fearful of leaving wife and daughter alone; since attacks upon Americans are continuing in spite of assurances by authorities they will be stopped, Department should consider warning Americans that they travel in Germany at their own risk.